Browsing by Author "Raghu, T.V."

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A Survey on Device to Device Communications
(Institute of Electrical and Electronics Engineers Inc., 2022) Raghu, T.V.; Manjappa, M.
The demand for the network capacity from the first generation to the current age of technology is exponentially increasing and it leads to scarcity of resources. The increase in the number of users and applications also causes more power consumption. In the future, billions of heterogeneous connected devices will be there and everyone will expect high-quality services. All requirements are to get higher data rates, minimum network latency, greater number of connected devices and more throughput. The existing spectrum resources technologies are insufficient to meet all of these cellular customers' requirements. Device-to-Device (D2D) communication is a potential strategy for increasing device performance by enabling direct transfer between user pairs that are close to each other. The benefits of employing D2D communication include lower network latency, reduced power consumption, greater throughput, spectrum reuse, and much more coverage area. Because D2D users use the same licensed spectrum as cellular users, interference control between cellular users and D2D users is regarded as one of the most essential concerns when D2D is introduced to cellular networks. We present a detailed review of the various state-of-the-art methodologies for interference management in D2D communication supported in cellular networks. The different D2D communication mode is also investigated using various scenarios for resource sharing between cellular and D2D users. Moreover power consumption techniques are also analyzed to improve the battery life conservation. Â© 2022 IEEE.
An Iterative-Based Optimum Power and Resource Allocation in Application-Dependent Scenarios for One-to-One D2D Communication
(Institute of Electrical and Electronics Engineers Inc., 2024) Raghu, T.V.; Manjappa, M.
Efficient and timely sharing of critical information is crucial for Public Safety (PS) communications, which can be fulfilled using one of the cutting-edge technologies, Device-to-device (D2D) communication. During an emergency, the PS applications should be prioritized over other applications, ensuring the emergency messages reach the first responders in time. Due to its inherent characteristics, the evolved Node Base station will not prioritize or categorize the D2D communication based on its application type, thus treating all applications equally. Further, D2D communication introduces significant interference to cellular users and vice-versa while sharing resources, and it is vital to reduce the impact of these interferences to ensure the Quality of Service for all users in the network. Hence, this article proposes a novel interference management approach to increase the overall sum rate of the system. In addition, the proposed approach also allows more D2D communication in general, particularly PS application-based D2D communication, to be active in the network. As the formulated problem is a Mixed-Integer Non-Linear Programming (MINLP) type of problem, it is split into two sub-problems, namely, Iterative Resource Allocation and Sharing and Iterative Power Optimization to achieve a polynomial time complexity. The theoretical proofs adequately explain the algorithm's time complexity and convergence property. The simulation results show that the proposed system enhances the overall sum rate by allowing more active PS D2D applications in the network. © 2013 IEEE.
Prioritized and optimum Resource Allocation for Public Safety Applications in Overlay D2D Communication
(Institute of Electrical and Electronics Engineers Inc., 2023) Raghu, T.V.; Manjappa, M.
D2D communication can be used for public safety as well as commercial applications. Public safety applications require efficient delivery of crucial information to concerned authorities for sharing information and coordination to facilitate effective incident response. Commercial applications include messaging, streaming gaming, Etc. The emergence of 5G cellular networks has introduced a wide range of connected devices, resulting in increased challenges in spectrum reuse due to a more significant number of devices competing for limited resources. There is no distinction between public safety and commercial applications for resource allocation, and all user equipment in the network is treated equally. However, public safety communication has to get more privileges than commercial applications for resource allocation. In this study, we propose Weighted Round Robin(WRR) algorithm for resource allocation to D2D users in the overlay mode D2D communication cellular network. In the standard round-robin algorithm, all users are treated equally well irrespective of the application types and allocate resources sequentially one after another in a round-robin manner. In a WRR algorithm, we prioritize public safety applications over commercial applications for resource allocation in an inband-overlay mode and maximize the number of D2D pairs participating in the public safety application. The simulation result shows that the proposed algorithm prioritizes public safety applications for different weights. Â© 2023 IEEE.
Priority-Driven Resource Allocation and Power Optimization in D2D Communication
(Institute of Electrical and Electronics Engineers Inc., 2024) Raghu, T.V.; Manjappa, M.
This research proposes priority-driven application-based channel assignment and power optimization frameworks called Channel State Information-based Resource Allocation (CSIRA) and Binary Search Power Control Mechanism (BSPCM) in D2D-enabled cellular communication. The CSIRA framework is cluster-based and uses a K-means clustering algorithm to group the D2D users into clusters. CSIRA allows the D2D users to share the cellular user's resources without compromising the cellular user's Quality of Service (QoS) in each cluster. Also, CSIRA ensures that public safety communication will get an edge over commercial communication during resource allocation. In order to ensure the QoS for cellular users is maintained while also enhancing the sum rate of D2D communication, the CSIRA employs the BSPCM framework. BSPCM framework utilizes a binary search algorithm to determine the optimal transmission power required for guaranteed D2D transmission within a cluster, thereby mitigating interference effects. A theoretical proof is provided to show that the suggested frameworks converge to a stable matching and end after a finite number of iterations. Simulation results demonstrate that the proposed frameworks effectively prioritizes public safety over commercial applications while preserving optimal system efficiency and quality with minimal complications. © 2017 IEEE.